Appartus for extracting gold from ores.



No. 732,709. PATENTED JULY 7,. 1900` H.0R..-0ASSBL. y

APPARATUS FOR EXTRACTING GOLD FROM ORS.. A PPLIoATIoN FILED 00.122, 1902.

IVO MODEL.

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y UNITED STATES Patented July "i, 1903.

VPATENT OEEICE.

HENRY R. OASSEL, OF NEW YORK, N. Y.

'SPECIFICATION forming part of 'Letters Patent No. 732,709, dated July 7, 1903.

Application tiled October 22, 1902. Serial No. 128,256. (No model.)

To all whom it may concern:

Beit known that LHENRY R. OAssEL, a citizen of the United States, residing at New York city, (Manhattam) county and State of New York, have invented a new and Im-` proved Apparatus for Extracting Gold from Ore, of which the following is a speciication.

This invention relates to an improved apparatus for extracting gold from ores in au economical and effective manner.

The accompanying drawing'represents a side elevation, partly in section, of my improved apparatus.

The letter a represents la vat or vessel for containing ore and having a manhole provided with a cover a', that renders the vat vapor-tight. Into vat a pass metal pipes a2 and a3, leading, respectively, by flexible hose connections a4 a5 to an alkaline-bromin-solu tion tank b and an acid-tank c. The pipes a2 as are controlled by cocks b c and termi` nate above an overflow or distributing pan or mixer a7, arranged in the neck 0,6 of vat a, the pan being suspended from covero by fastenings ots. The pan a7 is arranged .within the upper part of vat a above the ore-level,

so that the mixed solutions are gradually dis;

Aand by pipe j", having cock f2, to the top of a closed vaporizing or scrubbing tower f. The tower f is filled with pebbles f3, adapted to subdivide the charge, while an air-blast may be introduced into the bottom of the tower through blast-pipe f4, connected'to an air-blower f6. From the bottom of tower f a bent pipe l leads t0 the gold-precipitating the bottom the tower g is connected by bent pipe i to a recovered-bromin-solution tank 7o. From this tank a pipe m, coupled to a pump or lifter fm', leads to tank b to form a cycle. The pipem has a faucet fm2 emptying into tank h and a cock m3 above said faucet.

For extracting gold from ore by means of the above apparatus I proceed as follows:

The vat a being charged with ore and tightly closed, I form in tank b a leaching solution by mixing bromin with sodium hydroxid.

This solution is` run into pan al simultaneously with a charge of sulfuric acid from tank c, by means of which the bromin is set free within the pan. y

The free acid bromin solution runs over pan a7, gradually leaches through the ore, and passes through the filter alo into the closed tankl d. The bromin during its passage through the o re dissolves the gold and combines also with the bases generally presentsuch as lime, 'magnesia, alumina, tc-forming bromids. The solution in tank cl will thus contain dissolved gold, free bromin, bromids,

and any excess of acid.

To recover all the bromin, it is necessary to decompose the bromids, and this is elected by a mixture of a bromate of sodium or other When all the bromin hasbeeu set free in the manner described, the solution from tank d is allowed to run through pipe'f' into vthe tower f, Within which it is .subdivided by means of the pebbles.

A jet of air intro-- duced at the bottoml of tower f through pipe f4 will now vaporize the bromin in the descendin g subdivided solution, the bromin va pors being driven by the air-blast through the pipefs into the bottom of the recoverytower g. A solution of an alkaline hydroxid, such as sodium hydroxid, is led from tank 7L through pipe h into the pan g2 to combine with the ascending bromin vapors and form an alkaline bromin solution, which I term the recoveredbr0min solution. This solution is runinto tank 7c and is thence pumped through pipe m into tank b for treating a new batch of ore after being mixed with acid from tank c. If desired, the solution from tower g may be run once more through tank h by closing cock m3 and opening faucet m2. The gold solution from the vaporizing-towerfdeprived of its free bromin runs into tank Z, where the gold is precipitated by hydrogen sulfid or in other manner.

The broinate and acid solution may be introduced into vat or vessel o, instead of Vat d; but in that case the solution from vat d is pumped into tank a to secure a thorough mixture and perfect decomposition of the bromids.

If the Vessel a is made in the form of a rotating barrel, I first introduce the mixture of bromate and sufcient acid to decompose the bromates and bromids. The ore is then charged, and inally the alkaline bromin so lution is added.

What I claim isl. In an apparatus for extracting gold from ore, the combination of an ore vessel with an inclosed solution-distributer arranged within the upper part of the vat above the orelevel, a pair of tanks, and pipes that lead from said tanks to said distributer, substantially as specified.

2. In an apparatus for extracting gold from ore, the combination of an ore vessel with an inclosed solution-distributor larranged within the upper part of the vat above the orelevel, a pair of tanks, pipes leading from said tanks to said distributer, a solution-vat connected to the ore vessel, and a tank connected to the solution-vat, substantially as specilied.

3. In an apparatus for extracting gold from ore, the combination of a solntion-vat with a communicating closed vaporizing tower, a pipe entering the bottom of said tower, an airblower connected with said pipe, an open'recovery-tower, a pipe leading from the upper part of the vaporizing-tower into the lower part of the recovery-tower, a precipitating tank connected with the Vaporizing-tower, and a recovery-tank connected with the recovery-tower, substantially as specified.

et. An apparatus for extracting gold from ore, composed of an ore vessel, an alkalinebromin-solution tank, and an acid-tankcommunicating therewith, a solution-vat, a communicating tank, a vaporizing-tower, an airblast pipe, a gold-precipitating tank and a bromin-recovery tower communicating with the vaporizing-tower, a pan in the recoverytower, a tank communicating therewith, a recovered-bromin-solution tank communicating with the recovery-tower, and means for connecting said tank with the alkaline-brominsolution tank, substantially as specified.

Signed by me at New York city, (ManhattalL) New York, this 21st day of October, -1902.

HENRY R. CASSEL.

Witnesses:

WILLIAM SCHULZ, F. v. BRIESEN. 

